Abstract
A new chemodosimeter based on dicyanomethylene-4H-chromene chromophore (probe 1) was developed as a ratiometric fluorescent probe in near-infrared range for F− with good selectivity in acetonitrile. Probe 1 could be used to directly visualize F− by the naked eye and showed more than 621-fold fluorescence enhancement at 715 nm upon reaction with F− upon excitation at 625 nm. The recognition of probe 1 to fluoride was featured by F−-induced red-shifts of both absorption (185 nm) and fluorescence peaks (132 nm) based on internal charge transfer (ICT) in acetonitrile. The desilylation reaction of 1 by F− was proposed for its dual absorption and emission ratiometric detection of fluoride.
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The authors thank the NSFC (project No. 21102037 and No. 21201057) for the financial support.
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Xie, P., Guo, F., Gao, G. et al. A near-Infrared Fluorescent Chemodosimeter for Ratiometric Detecting Fluoride Based on Desilylation Reaction. J Fluoresc 26, 1737–1742 (2016). https://doi.org/10.1007/s10895-016-1865-5
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DOI: https://doi.org/10.1007/s10895-016-1865-5